Method of inspecting the interior of small holes



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Otfice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED APRIL 14, 1970 For inspecting the interior of small deep boressuch as bores in spinnerets employed for melt spinning of syntheticfilaments the interior of the hole is illuminated by passing a lightbeam from a high intensity zirconium arc lamp (12) through an achromaticcondensing lens (14) and an achromatic focusing lens (16). The lenssystem collects a large angle of the light emitted from the zirconium-arc and condenses it such that a narrow high intensity beam ofconverging light emerges from the passage through nose piece (22). Irisdiaphragm (24) is useful in reducing the diameter of the beam. A halfsilvered mirror (28) directs the light beam into the hole the focalpoint of the light beam being at or near the entrance to the hole and onthe centerline of the hole. A microscope (30) is positioned with itsoptical axis in line with the center of the hole for inspecting theinterior of the hole.

A ril )14, I i970 F. T. TARASCHI METHOD OF INSPECTING THE INTERIOR OFSMALL HOLES Original Filed May 5, 1967

